Disassembly/Assembly Instructions
Important: The manufactures warranty is void if the tool is disassembled before the warranty expires. Use these instructions in conjunction with the Part
Number 96283 Tool Repair Kit. This kit includes special tooling for the proper disassembly/assembly of the Two-Hand Gear-Driven Sander. This Tooling will
be referred to in these instructions. An air motor Tune-Up Kit, Part Number 98221 is also available. It contains the high and medium wear components that
most commonly need replacement.
Motor Disassembly:
1. Shut the air supply and disconnect the sander from the air supply hose.
2. Use the 57092 Repair Collar to hold the sander in a vise. Position the sander so that the backing pad is facing up. Note: Do not over tighten the collar and sander in the
vise. Hold the sander snugly, so that the motor lock ring can be removed easily.
3. Use a 9/64" hex key wrench to remove the screws and backing pad from the sander.
4. Use a 4mm hex key wrench to remove the balance arm assembly by turning the hex key counterclockwise.
5. Remove the 56474 Balance Washer and 56452 Mount Plate Assembly. Remove 96166 Set Screw.
6. Use the 56599 Lock Ring Tool to remove the 57332 Lock Ring by turning it counterclockwise.
7. Pull the air motor assembly out of the housing.
8. Use retaining ring pliers to remove the 95626 Retaining Ring.
9. Remove the 95911 O-Ring from the 56495 Cylinder and fasten a 2" bearing separator around the part of the cylinder that is closest to the 54629 Rear Bearing Plate.
10. Place the air motor with the bearing separator attached, onto the table of the 96232, #2 Arbor Press so that the balance end of the 56589 Shaft is pointing down.
11. Use a 5/16" dia. flat end drive punch as a press tool to push the shaft out of the 01206 Bearing. Use the 96213 Bearing Removal Tool to push the 01206 Bearing out of the
54629 Rear Bearing Plate. Note: This bearing removal tool is not included in the 96283 Repair Kit. Use the removal tool to push the 01206 Bearing out of the 54629 Rear
Bearing Plate.
12. Remove the cylinder, rotor, vanes, and key.
13. Secure the 96249 Collar around the outside diameter of the 56559 Front Bearing Plate.
14. Secure the collar in a vise so that the pinion gear is facing up. Use a Heat Gun to apply heat to the pinion gear. Use the 96181 Pinion Wrench or adjustable groove pliers to
grip the pinion gear and turn counterclockwise to remove it from the 56559 Front Bearing Plate.
15. Use a 2" bearing separator and arbor press to remove the 57749 Pinion Gear from the 56559 Front Bearing Plate.
16. Disassemble mounting plate sub-assembly:
a.) Remove 96276 Nuts (4) and 96274 Screws then lift out gear.
b.) Remove 96118 Screws (3).
c.) Press out 96423 Bearing by using
57091 Bearing Press Tool.
Motor Disassembly Complete.
Motor Assembly:
Important: Clean and inspect all motor parts for wear or defect.
1. Install 56133 Bearing on the balance end of the 56589 Shaft.
2. Use the small end of the 50791 Bearing Press Tool and the 96232, #2 Arbor Press to push the 56133 Bearing onto the shaft until the I.D. of the bearing sits against the
shaft step. (Drawing 1)
3. Install the 57332 Lock Ring onto the 56559 Front Bearing Plate so that the threaded portion of the lock ring sits against the bearing plate.
4. Secure the 96249 Collar around the outside diameter of the 56559 Front Bearing Plate.
5. Secure the collar in a vise so that the thread of the lock ring is facing up. Apply a small amount of Loctite #243 (or equivalent) to the thread of the lock ring. Position the
counter-bored end of the pinion gear toward the lock ring. By hand install the pinion gear. Use the 96181 Pinion Wrench or adjustable groove pliers to grip the pinion gear
and turn clockwise to secure it to the 56559 Front Bearing Plate. (Torque to 34•Nm/300 in. lbs.)
6. Mounting Plate Sub-Assembly:
a.) Press 96423 Bearing into mounting plate.
b.) Insert 96118 Screws (3) and apply 1 drop of #271 Loctite
®
(or equivalent). Note: All screws should be hand tight before torque is applied.
c.) Press 57749 Gear into mounting plate, making sure to align mounting holes and that the 96273 O-Ring on back of gear is in place before assembly to mounting plate.
d.) Insert 96275 Washers into c-bore in gear.
e.) Apply 1 drop of #271 Loctite
®
(or equivalent) to 96274 Screws (4), insert through gear and thread into mounting plate torque 7 N•m/60 in. - lbs. Insert 96276 Nuts (4)
and torque 7 N•m/60 in. - lbs.
7. Use the large end of the 57091 Bearing press Tool and the arbor press to install the front bearing plate onto the 56133 Bearing. (Drawing 2)
8. Install the 54673 Key so that the 90° side of the key fits into the keyway of the shaft and the tapered side of the key fits into the rotor. Install the 54705 Rotor/Blade Set (5)
onto the shaft
9. Apply the 95842 Dynabrade Air Lube (10W/NR or equivalent) to the blades.
10. Install the 56495 Cylinder over the rotor so that the short line-up pin fits into the front bearing plate.
11. Place the 54629 Rear Bearing Plate over the shaft so that the long line-up pin fits through the hole in the rear bearing plate.(Drawing 3) Use the small end of the 57091
Bearing Press Tool to install the 01206 Bearing onto the shaft and into the 54629 Rear Bearing Plate. Use the press tool and the arbor press to install these so that there is
a snug fit between the bearing plates and the cylinder. Note: Carefully press the 01206 Bearing onto the motor shaft until it touches against the bearing seat on the inside
of the bearing plate. (Drawing 4)
12. Use retaining ring pliers to install the 95626 Retaining Ring so that the concave side of the ring is toward the motor assembly. Note: Be sure that the retaining ring is com-
pletely pressed down into the groove on the shaft.
13. Use the 57092 Repair Collar to hold the housing in a vise so that the opening for the housing is facing up. Note: Do not over tighten the collar and housing in the vise. Only
hold the housing snugly, so that the motor and lock ring can be installed easily.
14. Apply a small amount of petroleum lubricant to the 95911 O-Ring and install the o-ring into the air inlet hole in the cylinder.
15 Install the motor assembly into the housing making sure to align the line-up pin with the line-up hole that is on the inside of the housing.
16. Use the 56599 Lock Ring Tool to secure the motor in the housing. (Torque to 34 N·m/300 in. lbs.) Align holes in 57332 Lock Ring with holes in housing.
17. Use 2mm hex key and install 96166 Set Screw into the housing through one of the holes in the lock ring until set screw is flush with the top of the lock ring.
18. Install the appropriate shroud onto the housing.
19. Apply a small mount of the 95542 Grease to the mount plate gear and then install the 56452 Mount Plate Assembly and the 56474 Balance Washer onto the 56589 Shaft.
Apply a small amount of the Loctite #243 (or equivalent) to the threads of the 96477 Screw. Hold the balance arm assembly stationary with an adjustable wrench and use a
5/32" hex key to tighten the 96477 Screw by turning it clockwise. (Torque to 9N·m/80 in. lbs.)
20. Use the 95541 Grease Gun to apply 2 full plunges of the 95542 Grease through the grease fitting that is located in the 56452
Mount Plate Assembly. Two full plunges of
grease should be applied after every 300-hour interval of use.
21. Use a 9/64" hex key wrench to install a weight-mated sanding pad.
Motor Assembly Complete.
5